/*-------------------------------------------------------------------------
 *
 * postgres_ext.h
 *
 *     This file contains declarations of things that are visible everywhere
 *  in PostgreSQL *and* are visible to clients of frontend interface libraries.
 *  For example, the Oid type is part of the API of libpq and other libraries.
 *
 *     Declarations which are specific to a particular interface should
 *  go in the header file for that interface (such as libpq-fe.h).  This
 *  file is only for fundamental Postgres declarations.
 *
 *     User-written C functions don't count as "external to Postgres."
 *  Those function much as local modifications to the backend itself, and
 *  use header files that are otherwise internal to Postgres to interface
 *  with the backend.
 *
 * $PostgreSQL: pgsql/src/include/postgres_ext.h,v 1.17 2007/02/06 09:16:08 petere Exp $
 *
 *-------------------------------------------------------------------------
 */

#ifndef POSTGRES_EXT_H
#define POSTGRES_EXT_H

/*
 * Object ID is a fundamental type in Postgres.
 */
typedef unsigned int Oid;

#ifdef __cplusplus
#define InvalidOid      (Oid(0))
#else
#define InvalidOid      ((Oid) 0)
#endif

#define OID_MAX  UINT_MAX
/* you will need to include <limits.h> to use the above #define */


/*
 * Identifiers of error message fields.  Kept here to keep common
 * between frontend and backend, and also to export them to libpq
 * applications.
 */
#define PG_DIAG_SEVERITY        'S'
#define PG_DIAG_SQLSTATE        'C'
#define PG_DIAG_MESSAGE_PRIMARY 'M'
#define PG_DIAG_MESSAGE_DETAIL  'D'
#define PG_DIAG_MESSAGE_HINT    'H'
#define PG_DIAG_STATEMENT_POSITION 'P'
#define PG_DIAG_INTERNAL_POSITION 'p'
#define PG_DIAG_INTERNAL_QUERY  'q'
#define PG_DIAG_CONTEXT         'W'
#define PG_DIAG_SOURCE_FILE     'F'
#define PG_DIAG_SOURCE_LINE     'L'
#define PG_DIAG_SOURCE_FUNCTION 'R'

#endif

